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Title: Ultrastrong magnon–magnon coupling dominated by antiresonant interactions
Authors: Makihara, Takuma
Hayashida, Kenji
Noe II, G. Timothy
Li, Xinwei
Marquez Peraca, Nicolas
Ma, Xiaoxuan
Jin, Zuanming
Ren, Wei
Ma, Guohong
Katayama, Ikufumi
Takeda, Jun
Nojiri, Hiroyuki
Turchinovich, Dmitry
Cao, Shixun
Bamba, Motoaki  kyouindb  KAKEN_id  orcid https://orcid.org/0000-0001-9811-0416 (unconfirmed)
Kono, Junichiro
Author's alias: 馬場, 基彰
Keywords: Magnetic properties and materials
Polaritons
Quantum optics
Issue Date: 2021
Publisher: Springer Nature
Journal title: Nature Communications
Volume: 12
Thesis number: 3115
Abstract: Exotic quantum vacuum phenomena are predicted in cavity quantum electrodynamics systems with ultrastrong light-matter interactions. Their ground states are predicted to be vacuum squeezed states with suppressed quantum fluctuations owing to antiresonant terms in the Hamiltonian. However, such predictions have not been realized because antiresonant interactions are typically negligible compared to resonant interactions in light-matter systems. Here we report an unusual, ultrastrongly coupled matter-matter system of magnons that is analytically described by a unique Hamiltonian in which the relative importance of resonant and antiresonant interactions can be easily tuned and the latter can be made vastly dominant. We found a regime where vacuum Bloch-Siegert shifts, the hallmark of antiresonant interactions, greatly exceed analogous frequency shifts from resonant interactions. Further, we theoretically explored the system’s ground state and calculated up to 5.9 dB of quantum fluctuation suppression. These observations demonstrate that magnonic systems provide an ideal platform for exploring exotic quantum vacuum phenomena predicted in ultrastrongly coupled light-matter systems.
Rights: © The Author(s) 2021
This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder.
URI: http://hdl.handle.net/2433/267492
DOI(Published Version): 10.1038/s41467-021-23159-z
PubMed ID: 34035241
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